Help
Options
Question
The location of the testes outside the body within the scrotum allows?
click to flip
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't know
Question
What is the role of homeotic genes during development?
Remaining cards (43)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Bio Chapter 35
Reproduction and Development
| Question | Answer |
|---|---|
| The location of the testes outside the body within the scrotum allows? | a slightly cooler temperature for sperm to develop. |
| What is the role of homeotic genes during development? | regulate the correct placement of animal body parts |
| ______ are organs that contain germ cells, which give rise to gametes. | Gonads |
| In egg formation, meiosis is not completed until ______ occurs. | Fertilization |
| Select all the types of signals that can stimulate cell development and differentiation during animal development. | -Hormones -Protein Gradient -Homoetic genes |
| Select all of the following effects of testosterone in adult males. | -sustain the libido -stimulate sperm production -control activity of the prostate gland |
| In males, testosterone causes the secretion of ______ during puberty. | Growth hormone |
| During ovulation, a ______ is released from its follicle and is swept into the ______. | secondary oocyte, uterine tube |
| In females, progesterone and estrogen are secreted by the ______ in response to stimulation by FSH and LH secreted by the ______. | ovaries; anterior pituitary |
| How do birth control pills and injections act to prevent contraception? | prevent ovulation |
| After ovulation in animals, the ruptured follicle differentiates into a gland called the | corpus luteum. |
| High levels of estrogen exert ______ on the secretion of hormones from the hypothalamus and anterior pituitary. | Negative Feedback |
| For fertilization to occur, the sperm must pass through ______ cells that surround the ovum. | Follicle |
| On average out of 100 sexually active, fertile women, how many will become pregnant each year if no birth control is used? | 85 |
| What is the gastrula stage | stage when three germ layers form |
| What is the morula? | Consists of 16 or more cells in a solid ball |
| What is a blastocyst? | A hollow sphere consisting of the inner cell mass and trophoblast outer layer |
| What is a zygote? | fertilized egg cell |
| What is the Fetal stage? | stage when organ systems continue to develop and become functional |
| What is the Embryonic stage? | germ layers begin to differentiate into organ systems |
| About 7 days after fertilization, the ______ has formed and consists of an inner cell mass and fluid surrounded by a layer called the trophoblast. | Blastocyst |
| In a process called ______, the trophoblast sends out projections and secretes enzymes to embed the blastocyst into the uterine lining. | Implantation |
| The embryonic stage of human development occurs from? | implantation to 8 weeks. |
| The ___ ___ manufactures blood cells until week 6 | Yolk sac |
| An embryonic layer called the ______ forms the inner layer of the gastrula. | Endoderm |
| The amnion helps maintain a regulated temperature and ______ that protects the developing embryo. | Pressure |
| Select the four membranes that protect and nourish the developing embryo. | -chorion -yolk sac -amnion -allantois |
| The extraembryonic membrane called the ______ contains fluid that cushions the embryo and maintains a constant temperature. | Amnion |
| Outpouching of the yolk sac; gives rise to the blood cells in the umbilical cord | Allantois |
| At about 3 weeks, the ______ forms along the back of the embryonic disc and becomes a longitudinal axis around which structures organize as they develop. | Primitive streak |
| The ______ is a structure that forms from a combination of embryonic tissues and endometrial tissues and that nourishes the embryo. | Placenta |
| Connects baby to mom's circulation, will eventually be replaced by the placenta | Chorion |
| Put the structures into the order that they arise during embryonic development, beginning at the top with the first structure. | 1. embryonic disk 2. Primitive streak 3. neural groove 4. neural tube |
| elect all of the following that are true about the human embryo around 4 weeks. | -embryo is about 6 millimeters long -neural crest cells migrate and form the foundation of the peripheral nervous system -limb buds appear |
| The organ systems have formed, are functioning, and begin coordinating during the ______ stage. | Fetal |
| Select all of the following that are exchanged between the fetal blood vessels and the mother's blood at the placenta. | -glucose -ions and amino acids -oxygen and carbon dioxide -urea and other wastes |
| By the end of the __ th week (2nd month), all organ systems are in place | 8 |
| ______ feedback induces hormonal changes to cause childbirth to initiate and continue. | Positive |
| By the 3rd month, what is noticed? | Bone is forming |
| True or false? Viruses can cause birth defects | True |
| In a positive feedback cycle, the hormone ______ stimulates contraction of uterine muscles during childbirth. | Oxytocin |
| When the hypothalamus secretes ______, the anterior pituitary gland secretes ______ that stimulate the ovaries in females. | GnRH; FSH and LH |
| During spermatogenesis, which of the following is the first haploid cell? | Secondary Spermatocyte |
| What are the products of meiosis I in oogenesis? | secondary oocyte and polar body |
Created by:
Sydboyer15
Popular Biology sets